How do pulse modulated valves control flow?
What will be an ideal response?
They open and close rapidly in pulses. The overall amount of flow is controlled by how long the valve is open versus how long it is closed.
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Central air conditioning systems operate with a design evaporator saturation temperature of about ____________________ºF.
Fill in the blank(s) with the appropriate word(s).
Why is a vacuum line attached to a fuel-pressure regulator on many port-fuel-injected engines?
A) To create an equal pressure drop across the injectors B) To draw fuel back into the intake manifold through the vacuum hose C) To raise the fuel pressure at idle D) To lower the fuel pressure under heavy engine load conditions to help improve fuel economy
If a fastener is stripped during the installation of a lap-seam roof, remove the fastener and _____
a. replace it with one of the next larger size b. replace it with one of the same size c. fill the hole with mastic d. replace it with a metal plug
Transportation inventories can be reduced by:
A) reducing transportation time. B) increasing order quantities. C) reducing the order point. D) reducing order quantities. E) none of the above